Bug#894462: paraview: edges are blotted [regression]

[Francesco Poli (wintermute)]

Package: paraview
Version: 5.4.1+dfsg4-2
Severity: grave
Justification: renders package unusable

Hello paraview Debian package maintainers,
thanks for uploading a Debian revision that uses Qt5 rather than Qt4!

I've just upgraded to it on my Debian testing box, but I found a bad
regression that renders the package unusable to create beautiful and
clear visualizations (this may be considered as basically the main
purpose of paraview!).


The attached test case is based on one of the data files generated
by the little program included in the test case sent for bug #892293.
The program source (written in Fortran) is included again for
completeness' sake.

Steps to reproduce the regression:

  0) start paraview

     $ paraview

  1) click on the "Open" button and open "wave0001.xyz"

  2) specify "PLOT3D Files" in the "Open Data With..." dialog window

  3) click on the "Apply" button
  
  4) change the representation from "Outline" to "Surface With Edges"

  5) from the File menu, select Save State...

  6) save the state as "wave_PARAVIEW-VERSION.pvsm"

  7) from the File menu, select Save Screenshot...

  8) save the screenshot as "wave_PARAVIEW-VERSION.png"


By performing these steps with paraview/5.4.1+dfsg3-2 and
with paraview/5.4.1+dfsg4-2, I obtained the two attached
screenshots.

In paraview/5.4.1+dfsg4-2 there seems to be a commendable attempt
to apply some antialiasing to all the lines (including the edges
on surfaces, the wireframe edges, but also the lines of the orientation
axes, and so forth...).
Unfortunately this new feature creates unsightly images, whenever
the edges are shown from a distance. Please take a look yourself
at the wave_5.4.1+dfsg4-2.png screenshot: all the intersections
between edges seem to be somehow "blotted" and unpleasant to look at.


Please fix this regression, as it makes paraview unusable.

Thanks for your time!
Bye.


-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (800, 'testing'), (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.15.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages paraview depends on:
ii  libavcodec57       7:3.4.2-1+b1
ii  libavformat57      7:3.4.2-1+b1
ii  libavutil55        7:3.4.2-1+b1
ii  libc6              2.27-2
ii  libcgns3.3         3.3.0-6
ii  libexpat1          2.2.5-3
ii  libfreetype6       2.8.1-2
ii  libgcc1            1:8-20180321-1
ii  libgl1             1.0.0-2
ii  libgl2ps1.4        1.4.0+dfsg1-2
ii  libglew2.0         2.0.0-5
ii  libhdf5-100        1.10.0-patch1+docs-4
ii  libjpeg62-turbo    1:1.5.2-2+b1
ii  libjsoncpp1        1.7.4-3
ii  libnetcdf13        1:4.6.1-1
ii  libogg0            1.3.2-1+b1
ii  libopenmpi2        2.1.1-8
ii  libpng16-16        1.6.34-1
ii  libprotobuf10      3.0.0-9.1
ii  libpython2.7       2.7.14-7
ii  libqt5core5a       5.9.2+dfsg-12
ii  libqt5gui5         5.9.2+dfsg-12
ii  libqt5help5        5.9.2-6
ii  libqt5network5     5.9.2+dfsg-12
ii  libqt5widgets5     5.9.2+dfsg-12
ii  libqt5x11extras5   5.9.2-1
ii  libstdc++6         8-20180321-1
ii  libswscale4        7:3.4.2-1+b1
ii  libtheora0         1.1.1+dfsg.1-14+b1
ii  libtiff5           4.0.9-4
ii  libx11-6           2:1.6.5-1
ii  libxml2            2.9.4+dfsg1-6.1
ii  libxt6             1:1.1.5-1
ii  python-autobahn    17.10.1+dfsg1-2
ii  python-matplotlib  2.1.1-2
ii  python-mpi4py      2.0.0-3
ii  python-six         1.11.0-2
ii  python-twisted     17.9.0-1
ii  tcl [tclsh]        8.6.0+9
ii  zlib1g             1:1.2.8.dfsg-5

Versions of packages paraview recommends:
ii  mpi-default-bin  1.10
ii  paraview-doc     5.4.1+dfsg4-2
ii  paraview-python  5.4.1+dfsg4-2

Versions of packages paraview suggests:
pn  h5utils     <none>
pn  hdf5-tools  <none>

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